Contents
Step-by-Step Guide: Preparing for a Dexamethasone Suppression Test
Published: Sep 26, 2024
Preparing for a dexamethasone suppression test (DST) is key for accurate results. This guide walks you through the steps to ensure you're ready for the test.
Before the Test
Consult your doctor about any medications you're taking, as some can affect the test results. Avoid alcohol and caffeine, as they may interfere with cortisol levels. Ensure you get a good night's sleep before the test for the most accurate results.
The Night of the Test
You'll take a dose of dexamethasone, usually 1 mg, around 11 PM. Make sure to follow the dosing instructions carefully. This is crucial because the timing and dosage affect how well the test can measure cortisol suppression.
What to Expect After
The morning after taking dexamethasone, you'll have a blood sample taken, typically around 8 AM. This sample will be used to measure cortisol levels and determine how well your body suppressed cortisol production. Results will guide further diagnostic steps if needed.
Frequently Asked Questions
It's a test to measure cortisol levels after taking dexamethasone.
Avoid certain meds, alcohol, caffeine, and ensure adequate sleep.
The test usually involves taking dexamethasone at night and a blood test in the morning.
Proper timing ensures accurate cortisol suppression measurement.
Next Steps
Proper preparation for a DST can lead to accurate and useful results in diagnosing cortisol imbalances.
References
- Cronin C, Igoe D, Duffy MJ, et al. The overnight dexamethasone test is a worthwhile screening procedure. Clin Endocrinol (Oxf) 1990; 33:27.
- Findling JW, Raff H. Recognition of Nonneoplastic Hypercortisolism in the Evaluation of Patients With Cushing Syndrome. J Endocr Soc 2023; 7:bvad087.
This article has been reviewed for accuracy by one of the licensed medical doctors working for Doctronic. Always discuss health information with your healthcare provider.
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